i just bought a v10 excursion with 120000 on it and i love it.i did some research and the 99 v10 had issues,(my buddy has one in his f250 and he replaced with newer one.) the later ones were better motors.i have seen many with 300000 or more on them.the exsaust manifolds are known to crack,so check that. like bones said the the plugs and coil packs are issues sometimes also.